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java.lang.NullPointerException: 	at com.cenqua.fisheye.web.admin.actions.user.UserMappingAdminAction.getUsers(UserMappingAdminAction.java:31)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:851)	at ognl.OgnlRuntime.getMethodValue(OgnlRuntime.java:1414)	at ognl.ObjectPropertyAccessor.getPossibleProperty(ObjectPropertyAccessor.java:60)	at ognl.ObjectPropertyAccessor.getProperty(ObjectPropertyAccessor.java:147)	at com.opensymphony.xwork.util.OgnlValueStack$ObjectAccessor.getProperty(OgnlValueStack.java:57)	at ognl.OgnlRuntime.getProperty(OgnlRuntime.java:2210)	at com.opensymphony.xwork.util.CompoundRootAccessor.getProperty(CompoundRootAccessor.java:102)	at ognl.OgnlRuntime.getProperty(OgnlRuntime.java:2210)	at ognl.ASTProperty.getValueBody(ASTProperty.java:114)	at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)	at ognl.SimpleNode.getValue(SimpleNode.java:258)	at ognl.Ognl.getValue(Ognl.java:494)	at ognl.Ognl.getValue(Ognl.java:458)	at com.opensymphony.xwork.util.OgnlUtil.getValue(OgnlUtil.java:192)	at com.opensymphony.xwork.util.OgnlValueStack.findValue(OgnlValueStack.java:224)	at com.opensymphony.webwork.components.Component.findValue(Component.java:240)	at com.opensymphony.webwork.components.IteratorComponent.start(IteratorComponent.java:192)	at com.opensymphony.webwork.views.jsp.ComponentTagSupport.doStartTag(ComponentTagSupport.java:34)	at org.apache.jsp.WEB_002dINF.jsp.admin.usermappingadmin_jsp._jspx_meth_ww_iterator_0(org.apache.jsp.WEB_002dINF.jsp.admin.usermappingadmin_jsp:1204)	at org.apache.jsp.WEB_002dINF.jsp.admin.usermappingadmin_jsp._jspService(org.apache.jsp.WEB_002dINF.jsp.admin.usermappingadmin_jsp:451)	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:93)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:470)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:364)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)	at org.mortbay.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1144)	at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:46)	at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:55)	at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:41)	at org.mortbay.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1136)	at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:46)	at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:55)	at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:41)	at org.mortbay.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1136)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:70)	at org.mortbay.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1136)	at com.cenqua.crucible.filters.CrucibleFilter.doFilter(CrucibleFilter.java:120)	at org.mortbay.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1136)	at com.cenqua.fisheye.web.filters.TotalityFilter.doFilter(TotalityFilter.java:201)	at org.mortbay.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1136)	at com.atlassian.security.auth.trustedapps.filter.TrustedApplicationsFilter.doFilter(TrustedApplicationsFilter.java:98)	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:236)	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)	at org.mortbay.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1136)	at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:46)	at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:55)	at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:41)